Improvement in locomotive-boiler furnaces



(149 2 Sheets--Sheet 1.

` P.W;MACKENZ|E.-

Improvement in Boiler Furnaces.

No. 122,841. Patete-d1an.16,1a72.

(149,) f 2 Sheets-Sheet 2. P.. WQ MACKENZIE.

Improvement in. Boiler Furnaces. No.122k841. Rw?. @aanraden-6,1872

er ff UNITED STATES PATENT OFFICE.

PHILIP W. MAGKENZIE, OF BLAUVELTVILLE, NEW YORK.

IMPROVEMENT IN LOCOMOTIVE-BOILER FURNACES.

Specification forming part of Letters Patent No. 122,841, dated January16, 1872.

To all whom it may concern:

Be it known that I, PHILIP W. MAcKENzIE, of Blauveltville, in the countyof Rockland and State of New York, have invented a new and usefulImprovement in Boilers of Locomotive- Engines; and I do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the accompanying drawing forming part of thisspecification, and in which- Figure l represents a longitudinalsectional elevation of the re-boX end of a locomotiveengine boilerconstructed in accordance with my invention; Fig. 2, a plan of the samewith a coal-bunker arranged on top of the fire-box removed; Fig. 3, afront elevation; and Fig. 4, a transverse section at the line m m inFigs. l and 2.

Similar letters of reference indicate correspondingparts throughout theseveral iigures of the drawing.

My invention consists in a combination, with the body of alocomotive-engine boiler, of a tire-box constructed of a metallic shelllined with fire-brick, lire-clay, or other like refractory material,whereby increased strength and durability is given to the boiler. Italso consists in a peculiar arched construction of the sides as well asthe roof of the fire-box, in combination with metallic angle pieces orstays for supporting the lire-brick or refractory lining in separatearches, whereby increased strength and greater facility of repair areobtain ed and a convenient space is afforded for the drivin g-wheels ofthe locom otive-engine on either side of the fire-box. The inventionalso comprises a novel arrangement, relatively with the furnace, of apipe for supplying air to the latter over the re, for the purpose ofpromoting the combustion of the gases in the furnace, said pipe beingprojected through a coal-hopper on top of the fire-box and beingprovided at its forward end with a valve or damper for regulating theadmission of air over the iire.

Referring to the accompanying drawing, A represents the tubularcylindrical body of a locomotive-boiler, and Bits fire-box, which, in--stead of being constructed with a water-casin g so as to form anintegral portion of the waterspace of the boiler, is a separate metallicstructure rmly secured to the front end of the body A, and formed of ametal shell, with a lining', G Cf, of re-brick, lire-clay, or other likerefractory and non-conductin g material. This combination provides for amuch stronger construction of locomotive-engine boilers, inasmuch as allthe strain due to the pressure of the steam is coniined to thecylindrical body A, and is taken oii' the fire-box B and its crownsheet, which, or the stays binding the same, are ordinarily the partsrirst to give out, while by only slightly lengthening the body A thesteam and water space of the boiler is in nowise reduced. Said fire-boxB is arched not only at its roof but also at its sides, and the latterarranged to approach each other toward the lower portion of thefire-box, whereby the side linings C are better stayed or supportedagainst falling and room is provided outside of the fire-box, on eitherside of it, for the driving-wheels of the locomotive, without alteringthe present construction of engine-frame. The arched side linings C androof lining O are each made separate the one from the other, and aresupported at their ends, and the shell of the Iirebox stiifened, bymetallic anglepieces D iirmly riveted or secured to the shell. Thisconstruction protects the fire-brick lining as a whole from breaking orworking loose, and provides for the ready replacement of any one of theinterior arches or linings C Gas, for in stance, the crown-linin gG-without interfering with or destroying the others.

The lire-box B is here' represented as more particularly adapted, by itsinterior shape and size relatively with the boiler or outlet to thesmoke-tubes thereof, to the burning of bituminous or partly-bituminouscoal; but it may be proportioned for burning other coal or fuel. Thegrate E is set inclining downward in a backward direction; but it may behorizontal.

F is the ash-pit, the door Gr of which is fitted with a damper, b. Thereis also a door, H, above the grate for inserting kindling and foradjusting the fuel on the grate if necessary 5 but the supply of coal tothe furnace after the fire has been fairly started it is preferred tomake automatic by means of a series of front feed-tubes, I, surroundedby a water-box, J, connected with the body A of the boiler, saidfeed-tubes projecting downward in an inclined direction backwardly, andopening at their upper ends into an extended hopper or bunker, K,arranged over the top of the nre-box.

The door H may be provided with apertures c for introducing air in frontand over the grate, in close proximity to the fuel feed-tubes l forsupplying oxygen for the combustion of the hydrocarbon gases as soon asdeveloped, and to combine with the carbonic oxide that may be producedfrom the incandescent fuel on the grate.

Instead of these air-openings 0, or in addition to them, the furnace mayalso be, and is Yhere represented as, provided with a series ofapertures, d, in its roof for admitting air for the same purpose. Theseopenings d, which should be shaped to admit the air in sheets or jetsover the lire, open into a box or bonnet, L, within the bunker K, andsaid bonnet is provided With a pipe or duct, M, arranged to pass throughthe coal in the bunker out to the front thereof, and fitted with a valveor damper, e, at its outer exposed end, whereby the admission of air maybe established and shut off or regulated at pleasure by the engineer orhis assistant from the front of the iire-box.

What is here claimed, and desired to be secured by Letters Patent, is-

1. The combination, with the cylindrical tubular body A of alocomotive-engine boiler, of a fire-box, B, constructed of a metallicshell lined with fire-brick, fire-clay, or other like refractorymaterial, and arranged in relation with the body of the boiler,substantially as specified.

2. The lire-box B, constructed of a metallic shell arched on its roofsand sides, and with the latter arranged to approximate each other in adownward direction, in combination with the independent linings C C ofrefractory material, as described, and angle-pieces or stays D,essentially as herein set forth.

3. The combination, with the fuel-hopper K and openings d through theroof of the {irebox, of the bonnet L and air-pipe or duct M providedwith a valve for operation from the front ofthe lire-box, substantiallyas specified.

P. W. MAOKENZIE.

FEED TUsoH. (94c

